37 results about "Covalent functionalization" patented technology

The invention discloses covalent functionalization graphene and a preparation method thereof. The preparation method of the covalent functionalization graphene comprises the following steps of: adding 1 part by weight of graphene oxide and 0.1-100 parts by weight of azido substances to a reactor; reacting for 0.1-72 hours in a hot bath at 100-220 DEG C; filtering, centrifugalizing, and washing to obtain the covalent functionalization graphene. In the invention, the graphene oxide is used as a raw material to directly react with an azido compound to prepare a covalently-modified functionalization graphene material based on nitrene chemistry by adopting a one-step method. The preparation method has simple and convenient method, simple process and large-scale production, is a general method and can enable multiple functional groups (such as hydroxyl, carboxyl, amino, bromo and long alkyl group) and high polymers (such as polyethylene glycol and polystyrene) to be covalently connected to the graphene. The obtained covalent functionalization graphene has good solvent dispersity and conductivity, and can be processed in a solvent and widely used in the fields of micro-nano electron, machinery, chemical engineering, high performance materials, and the like.

The invention belongs to the cross field of an organic/inorganic nanometer compound and a functional high-molecular material, and provides a preparation method and application of a graphene oxide/silicon dioxide/polyaniline composite material, aiming at solving the problems that the effect of promoting the property of a polymer and final using effect are influenced by reducing the self mechanical strength, electricity-conducting property, heat-conducting property and the like of graphene oxide due to the structural change of a carbon atom contained in graphene oxide. The graphene oxide/silicon dioxide/polyaniline composite material comprises the following three components in percentage by mass: 5%-90% of graphene oxide, 5%-90% of silicon dioxide and 5%-90% of polyaniline. According to the preparation method provided by the invention, the technical problem that graphene oxide prepared through the traditional covalent functionalization method is not high in property when used as a filler is solved by modifying graphene oxide through non-covalent functionalization effect.

The invention belongs to the field of war-industry high-power-laser protective materials, and particularly relates to an organic-transition-metal tin-porphyrin axial covalent functionalization multiwalled-carbon-nanotube nano-hybrided nonlinear optical function material with good nonlinear absorption performance and a preparing method thereof. According to the material and the preparing method, organic-transition-metal tin porphyrin is axially connected to the surfaces of multiwalled carbon nanotubes in a covalent bond mode through 1,3-dipole cycloaddition; due to the synergistic effect between the tin porphyrin and the multiwalled carbon nanotubes, the solubility, the dispersion stability and the nonlinear optical absorption performance of the multiwalled carbon nanotubes are improved, and the scheme is not simple physical mixing of the two different optical function materials. The prepared nonlinear optical function material has quite good solubility and quite good dispersion stability in organic polar solvents, and has quite high nonlinear optical absorption performance, and therefore the organic-inorganic nano-hybrided nonlinear optical function material shows important scientific research value and good practical application prospects.

The invention belongs to the field of military industry strong laser protective material, and more specifically discloses organic transition metal stannum porphyrin axial functionalized reduced graphene oxide nano hybrid light-sensitive functional materials with excellent nonlinear absorption performance, and a preparation method of the organic-inorganic covalent functionalized nano materials. Development of the novel porphyrin covalent graphene nonlinear absorption materials with excellent solubility is used for solving problems that graphene is poor in solubility and dispersion stability, and conventional strong laser protective materials are limited. According to the preparation method, organic transition metal stannum porphyrin is connected with the surface of reduced graphene oxide via covalent axial bonds via 1,3-dipolar cycloaddition and free radical addition instead of simple physical mixing of two materials with different optical functions; solubility, dispersion stability, and nonlinear absorption performance of graphene are improved via synergistic effects of organic transition metal stannum porphyrin with reduced graphene oxide; nonlinear optical performance and solubility of the obtained materials are improved greatly; and application prospect is promising.

The invention relates to a triple molten porphyrin dimer covalent functionalized single-walled carbon nanotube non-linear nano hybrid material and a preparation method thereof. The non-linear nano hybrid material is formed by connecting a triple molten porphyrin dimer TFP to the surface of SWCNT through covalent bonds. Compared with the prior art, the organic-inorganic covalent functionalized nanofunctional material is prepared by connecting TFP to the surface of SWCNT through covalent bonds and the azo salt free radical addition reaction instead of simply and physically mixing the two different optical functional materials, and compared with a traditional material, the prepared material not only has enhanced nonlinear optical properties in the nanosecond visible light field, but also canconvert saturated absorption of a traditional material into anti-saturated absorption in the femtosecond near-infrared field, and has a very wide application prospect.

The present invention is related to a new method for directly covalently functionalizing carbon nanotubes (CNTs) grown on or attached to a surface. The invention also features devices that are comprised of CNTs.

The invention discloses a vinyl sulfone-based silicon nano material surface functionalization method which comprises the step: enabling a vinyl sulfone derivative to directly react with silicon hydroxyl on the surface of a material under a catalysis condition, thereby achieving covalent functionalization of a silicon-based material. By adopting the method, functionalization of multiple silicon nano materials can be achieved, and the method is wide in substrate application range; the material does not need to be pretreated, and the method is high in operability and high in reproducibility; themethod is gentle in reaction condition, simple to operate and good in environment protection; a single-layer function surface can be generated, and high reaction controllability can be achieved; and the method is a broad spectrum silicon nano material surface functionalization method with great potential.

The invention discloses a composite coating containing cardanol-based reactive diluent modified graphene oxide filler and a preparation method and application thereof.The coating is composed of a component I and a component II, and the component I comprises 0.1-1.0 part of cardanol-based reactive diluent modified graphene oxide nanosheets; 50 to 80 parts of petroleum-based epoxy resin; 20-50 parts of a cardanol-based reactive diluent; the component II is prepared from 40 to 50 parts of cardanol-based curing agent; 0.01 to 0.2 part of a defoaming agent; 0.03 to 0.3 part of a leveling agent; and 0.05 to 0.2 part of an anti-settling agent. The cardanol-based reactive diluent modified graphene oxide nanosheet (A-GO) is designed and synthesized through a simple covalent functionalization method, the dispersity and compatibility of GO in an epoxy resin matrix are improved, and the defects existing in an epoxy resin coating can be effectively overcome. The A-GO is added into the cardanol-based reactive diluent, and the A-GO and the cardanol-based reactive diluent have a synergistic effect, so that the A-GO/cardanol-based diluent/epoxy resin composite coating is finally obtained.

The invention discloses a preparation method of high-activity functionalized graphene capable of adsorbing fungaltoxin. Graphene oxide dispersion liquid of a single-layer or multi-layer structure and surfactant are mixed, then, a mixture is subjected to forth ultrasonic processing and is stirred for 24 to 48h at room temperature to obtain even mixed liquor, and the mixed liquor is stirred at the temperature of 70 to 95DEG C for 6 to 10h to obtain the functionalized graphene. The graphene oxide is taken as a raw material, amphipathy surfactant is used as modifier, the graphene is subjected to covalence functional modification through ion exchange and amidation reaction, the functionalized graphene with good soluble dispersion capacity is obtained, and the adsorption performance of the functionalized graphene is improved. The functionalized graphene has an outstanding adsorption effect on the fungaltoxin, and has high practical value and good application prospect.

The invention relates to a tetraphenylporphyrin covalent functionalized titanium disulfide nonlinear nano hybrid material and preparation thereof, the hybrid material is obtained by a free radical addition reaction of tetraphenylporphyrin diazonium salt TPP-N2 + BF4-and sulfur atoms on the surface layer of a titanium disulfide nanosheet, and the hybrid material is a first example about the covalent functionalization of the titanium disulfide nanosheet at present. Compared with a hybrid material obtained by simply and physically mixing the two types of optical functional materials, the hybrid material obtained by bonding carbon-sulfur covalent bonds shows a remarkably enhanced saturated absorption phenomenon in a visible light range. According to the invention, chemical modification methods of titanium disulfide are enriched, and the obtained material has a wide application prospect in the photoelectric fields of nonlinear optical devices and the like.

According to the polytetrafluoroethylene lip piece material for the sealing element and the processing technology of the polytetrafluoroethylene lip piece material, the added components and the technology are limited, the sealing performance of the lip piece material is greatly improved, the friction performance of the lip piece material is reduced, and the phenomena of severe abrasion and sticking burning cannot be generated on a product and a mating plate at the running speed of 60 m/s; polybenzoate and polyimide are selected to improve the wear resistance of polytetrafluoroethylene, synergistically enhance the mechanical strength of the lip sheet material and improve the following property of the oil seal; the method comprises the following steps: carrying out modification treatment on polytetrafluoroethylene by using aromatic polyamide fibers by using an electron beam irradiation modification method, and grafting side branches on double helix chains of the polytetrafluoroethylene; the prepared molybdenum disulfide has covalent functionalization; nano zinc oxide and ethylene bis stearamide are introduced; the prepared composite material needs to be placed for 3-5 days and then pressed, segmented sintering is adopted in the sintering process, the service life of the lip piece material is greatly prolonged, and the service life of the lip piece material prepared according to the method is longer than 8 years.

The present disclosure relates to a method for manufacturing a covalently functionalized coated magnetic nanoparticle and to said particles and uses thereof. The preparation method includes forming a shell of a hydrophilic polymer coating layer on top of a magnetic metal core coated with a carbon coating. In the method a particle comprising a magnetic metal core coated with a carbon coating is provided. The surface of the particle is subjected to covalent functionalization by generating amino reactive groups via diazonium chemistry and subsequently an irreversible attachment of an atom transfer radical polymerization (ATRP) initiator is carried out on said surface. A hydrophilic polymer layer is formed) by a surface initiated atom transfer radical polymerization (SI-ATRP) reaction with a monomer comprising N-isopropylacrylamide (NIPAM).

The present invention adopts a one-pot room-temperature reduction method to prepare an imidazole type dinitrile amine salt ionic liquid functionalized graphene supported platinum catalyst with excellent electro-catalytic performance. The method is characterized by selecting the reduced graphene oxide (rGO) with large specific surface area and better electrochemical performance as a carrier; through non-covalent functionalization, giving the more excellent conductivity to the reduced graphene oxide (rGO), and taking chloroplatinic acid as a platinum source and taking sodium borohydride as a reducing agent to prepare the imidazole type dinitrile amine salt ionic liquid functionalized graphene supported platinum catalyst. The prepared catalyst has good methanol oxidation electrocatalytic activity, carbon monoxide poisoning resistance and stability, so that the method has certain reference significance for the development, research and application of a direct methanol fuel cell anode catalyst.

The invention relates to a cationic porphyrin functionalized Ti3C2Tx nanosheet nonlinear nano hybrid material as well as preparation and an application thereof. The nonlinear nano hybrid material is formed by adsorbing cationic porphyrin TMPyP on the surface of Ti3C2Tx through electrostatic interaction. Compared with the prior art, TMPyP is adsorbed on the surface of Ti3C2Tx through electrostatic interaction, the organic-inorganic covalent functionalized nano functional material is prepared, and compared with a traditional material, the prepared material has enhanced nonlinear optical performance in the fields of nanosecond visible light and near infrared and has very wide application prospects.

The invention relates to a porphyrin covalent functionalized Ti3C2Tx nanosheet nonlinear nano hybrid material as well as preparation and application thereof. The nonlinear nano hybrid material is formed by connecting tetraphenyl porphyrin TPP to the surface of Ti3C2Tx through covalent bonds. Compared with the prior art, a TPP covalent bond is connected to the surface of Ti3C2Tx through a diazotization reaction, the organic-inorganic covalent functionalized nano functional material is prepared, the two different optical functional materials are not simply and physically mixed, and compared with a traditional material, the prepared material has enhanced nonlinear optical performance in the nanosecond visible light and near-infrared fields, and has a very wide application prospect.